A practical and efficient synthesis of 6-carboalkoxy-13-cycloalkyl-5H-indolo[2,1-a][2]benzazepine-10-carboxylic acid derivatives
作者:Piyasena Hewawasam、Yong Tu、Thomas W. Hudyma、Xiaofan Zhang、Robert G. Gentles、John F. Kadow、Nicholas A. Meanwell
DOI:10.1016/j.tetlet.2013.12.085
日期:2014.2
A convenient and practical synthesis of 6-carboalkoxy-13-cycloalkyl-5H-indolo[2,1-a][2]benzazepine-10-carboxylic acid derivatives (6) has been developed. The key step in the synthesis utilizes an intramolecular tandem reaction sequence of a Michael addition followed by a Horner–Wadsworth–Emmons (HWE) olefination reaction between hemi-aminal 11 and methyl 2-(dimethoxyphosphoryl)acrylate 12. The ring
已经开发了方便且实用的6-羰基烷氧基-13-环烷基-5 H-吲哚并[2,1- a ] [2]苯并ze庚因-10-羧酸衍生物(6)的合成方法。合成的关键步骤是利用迈克尔加成反应的分子内串联反应顺序,然后是半缩醛11与2-(二甲氧基磷酰基)丙烯酸甲酯12之间的Horner-Wadsworth-Emmons(HWE)烯化反应。环的构建有效地发生,并且产物6的纯化是直接的。6a的C-10甲酯选择性水解为羧酸13,而6d的烯烃在NaH存在下,使用三甲基碘化碘在DMSO中将其转化为环丙烷14。